[[File:Cpc shader mess.png|thumb|upright=1.5|GLSL shader example]]
[[File:Cpc hlsl shader mess detail.png|thumb|HLSL "1980s" shader (detail)]]
Like MAME, MESS can use shaders to simulate typical CRT graphics artifacts such as scanlines, colors bleeding into each other, jitter, and display curvature. This involves editing mess.ini (or ume.ini if you use UME).